Learnability, as set out in The Learnability Problem (PAR-001), describes how an adversary learns an operation's routine. Field observation makes clear that this is only one direction of a two-way process. When an operation responds to probing — changes a shift, varies a patrol, alters its signature — the adversary observes the response and learns from it. The counter-move becomes the adversary's next data point.
This means the response itself is learnable. An operation that disrupts the same way every time is not breaking the adversary's model. It is teaching a new one — a model of how the operation reacts. The disruption becomes the pattern.
Deterrence against an adaptive adversary is therefore not a state that is reached and held. It is a tempo that has to be sustained. Both sides are learning; the side that learns faster operates inside the other's decision cycle. The variable that decides the contest is not either party's absolute capability but the relative rate at which each adapts to the other.
This reframes the disruption described in The Adversary Learning Cycle (PAR-006). Invalidating an adversary's model is not a single act with a lasting result. It is a move in an ongoing exchange, and it must itself keep changing — because a predictable way of breaking predictability is simply predictability at one level up.
This note records an operational observation and its doctrinal implication. It does not describe how the platform re-calibrates against adversary counter-adaptation; that mechanism is not the subject of this note. A fuller treatment of bilateral learnability and relative learning rate is reserved for a future paper in the series.